6 x 9 Envelopes Booklet-Open Side...

Check O Matic
$8.99
Amazon Prime
9 x 12 Full Window Booklet...

Business Envelopes
$29.49
Amazon Prime
White 6" x 9" Envelopes - 100...

Desktop Publishing Supplies, Inc.
$12.95
Amazon Prime

9 x 12 Booklet Envelopes - Midnight...

Envelopes.com
$24.95
Amazon Prime
10 X 13 Booklet Envelopes - 24lb...

Superfine Printing Inc.
$12.90
Amazon Prime

9 x 12 Booklet Envelopes-Open Side...

Business Envelopes
$13.99
Amazon Prime
10 X 13 Booklet Envelopes - 28lb...

Superfine Printing Inc.
$12.90
Amazon Prime
6 x 9 Booklet Envelopes - 100...

LUXPaper
$21.95
Amazon Prime